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김좌관,한기백,이원구 慶星大學校 環境問題硏究所 1994 環境硏報 Vol.4 No.1
The purpose of this study is to compare with water quality prediction models for small and middle reservoir. These reservoirs has short rentention times, low depth, and weak stratification phenomenon. Thus, this study was to develop program through a series of modeling procedure for water quality management and prediction of small and middle scale reservoir in Korea, the specific results are as follows. First, The kind of state variables in model was focused on a series of water quality parameters connected with algae concentration which represent quantity of phytoplankton in water. Spatial scales of Hoeong Reservoir was determined as morphological features. therfore Four models were applied to Hoedong Reservoir such as 'Modified Two-Box Model(MTB)', 'Completely Mixed Model' and 'Epilimnion-Hypolimnion Model', MINLAKE Model'. Prediction ability of developed models on this study was tried by means of regression coefficients, RMSPE(Root Mean Square Percent Error), and Absolute Mean Error with 'MINLAKE' model applicable to natural lakes. Results showed that MTB(Modified Two-Box) model had higher prediction ability in comparison with 'Completely mixed' and 'Two-Box' model in chl-a, PO??-P, NH??-N, NO??-N concentration. Also, assuming that had correct input data, 'MINLAKE' model had high prediction ability comparatively. But it was concluded that 'MTB' model had higher prediction ability in all aspects than complicated ecological model, 'Completely mixed' model and 'Two-Box' model in small and middle scale reservoir of Korea.
산업공생 (Industrial Symbiosis) 을 통한 생태산업공단 조성 방안
김좌관 한국환경과학회 2000 한국환경과학회지 Vol.9 No.2
This study is focused on the industrial symbiosis based on industrial ecosystem theory. At first, the concept of industrial ecosystem was introduced. Industrial symbiosis is a good tool in order to make a harmony between industry and natural ecosystem. The good example of industrial symbiosis is the case of Kalundborg in Denmark, where 11 networks are working in four enterprises and one community nearby. It was proved that savings of natural resources and economic benefit are achieved by use of industrial symbiosis. Moreover, the control of pollutant emission was also done by use of advanced technology and investments. Based on this case, It was shown that industrial symbiosis through eco-industrial complex in Korea was confronted with many difficulties. First of all, loose emmision criteria, recycling system on wastes, and the absence of will for industrial symbiosis should be solved in Korea.
정장표,김좌관 慶星大學校 環境問題硏究所 1992 環境硏報 Vol.2 No.1
We have studied for the application eutrophication model and requirement of the basic data in ecological characteristics in man-made reservoirs. So in this study, we had the conclusions as follows. 1) It was proved phosphorous was limiting factor according to MBOD test results 2) Phosphorous deposition rate & velocity had high values because of injection of algicide & high productivity of algae. 3) SOD in Hedong reservoir had relatively low value as SOD of 0.618㎎/m²day 4) In photosynthethic survey, chl-a method was appropriate for the application of DO mass balance equation. Also, the highest DO production rate has placed on 3 m-depth.
정장표,김좌관 慶星大學校 1989 論文集 Vol.10 No.2
Ⅰ. Introduction In Korea, recently, eutriphication has been gradually accelerated due to the duscharge of nutrients aby municipal sources, as well as agriculturalrun-off. The domestic studies on the model among trophic prediction methods are at the initial satte. This study is the results from the application oif the predict the trophic satte using Seven Empirical Models, TSI, the Theory of Eutrophication model, etc. Ⅱ. Methods to evaluate Eutorphication 1. Seven empirical phosphorous models These seven models assume that phosphorous is the limiting nutrient for primary production in the lake being analyzed. These aeven models are as follows. ????? 4. the uncertainty theory of model (1) error analysis using vollenweider's model (2) error analysis using phosphorous discharge coefficent Ⅲ. Application and Conclusion The trophic state of the Nakdong estuary reservoir has the following results. ????? Consequently, the Nakdong estuary reservoir is at the europhic state. Therefore to restore and maintain reservoir in a desired the total loads must be reduced. Reduction of phosphorous input can be the following measures. 1. Phosphorous removal from wastwater treatemnt plant effluents. 2. Construction of Jangrim treatment plant. 3. Predging of Sediments. 4. Hypolimnetic aeration and destratification.
정장표,차건봉,김좌관 慶星大學校 環境問題硏究所 1993 環境硏報 Vol.3 No.1
The purpose of this study is to find out characteristics of nonpoint source-pollutant loads For this, in the aspect of water guality Change during storm days, the relationship between Stream flow and pollutant mass loads was studied. Also the contributions of loading rates from nonpoint sources were calculated. In this study, the drainage area of Sooyeong river, upstream of the Hoedong reservoir, was investigated. The reservoir used for drinking water source in Pusan, is located in a rural area and few point sources in its drainage area. The results of this study were as follows. Changes in water quality during rainfall showed that parameters such as COD, PO₄-P, T-P, NH₄-N concentration increased about two times, on the other hand, NO₂-N, NO₃-N concentration decreased to about two third of the concentrations in drying periods. The regression equations for stream flow versus pollutant loads were obtained as follows: COD : LOG(M)=-4.531+1.396×LOG(Q) r²=0.768 NH4-N : LOG(M)=-3.227+0.948×LOG(Q) r²=0.825 NO2-N : LOG(M)=-5.744+1.216×LOG(Q) r²=0.641 T-P : LOG(M)=-8.303+1.804×LOG(Q) r²=0.811 PO4-P : LOG(M)=-7.726+1.660×LOG(Q) r²=0.820 The rate of pollutant contributions from nonpoint sources was 80.4% for COD, 75.8% for NH₄-N, 53% for NO₂-N, 57.3% for NO₃-N. 85% for T-P, 89% for PO₄-P, and that of phosphorous pollutant was higher than that of inorganic pollutants. The loading rates of nonpoint pollutants were calculated as 3.76kg/ha/d(COD), 0.2kg/ha/day(NH₄-N), 0.076kg/ha/d(T-P), 0.037kg/ha/d(PO₄-P), respectively. Results above mentioned showed that the pollutant contributions from nonpoint sources were not negligible and the control and management of nonpoint source were urgently needed.